<?php
//邮箱验证
class smtp {

    /* Public Variables */
    public $smtp_port; //smtp_port 端口号
    public $time_out;
    public $host_name; //服务器主机名
    public $log_file;
    public $relay_host; //服务器主机地址
    public $debug;
    public $auth; //验证
    public $user; //服务器用户名
    public $pass; //服务器密码
    private $sock;


    public function __construct($relay_host = "", $smtp_port = 25, $user, $pass, $auth = false){

        $this->debug      = FALSE;
        $this->smtp_port  = $smtp_port;
        $this->relay_host = $relay_host;
        $this->time_out   = 30; //is used in fsockopen()
        $this->auth       = $auth; //auth
        $this->user       = $user;
        $this->pass       = $pass;
        $this->host_name  = "localhost"; //is used in HELO command
        // $this->host_name = "smtp.163.com"; //is used in HELO command
        $this->log_file   = "";
        $this->sock = FALSE;

    }

    /* Main Function */

    function sendmail($to, $from, $subject = "", $body = "", $mailtype, $cc = "", $bcc = "", $additional_headers = "") {
       $header    = "";
       $mail_from = $this->get_address($this->strip_comment($from));
       $body      = mb_ereg_replace("(^|(\r\n))(\\.)", "\\1.\\3", $body);
       $header .= "MIME-Version:1.0\r\n";
       if ($mailtype == "HTML") {
           //邮件发送类型
           //$header .= "Content-Type:text/html\r\n";
           $header .= 'Content-type: text/html; charset=utf-8' . "\r\n";
       }
       $header .= "To: " . $to . "\r\n";
       if ($cc != "") {
           $header .= "Cc: " . $cc . "\r\n";
       }
       $header .= "From: " . $from . "\r\n";
       // $header .= "From: $from<".$from.">\r\n";	//这里只显示邮箱地址，不够人性化
       $header .= "Subject: " . $subject . "\r\n";
       $header .= $additional_headers;
       $header .= "Date: " . date("r") . "\r\n";
       $header .= "X-Mailer:By (PHP/" . phpversion() . ")\r\n";
       list($msec, $sec) = explode(" ", microtime());
       $header .= "Message-ID: <" . date("YmdHis", $sec) . "." . ($msec * 1000000) . "." . $mail_from . ">\r\n";
       $TO = explode(",", $this->strip_comment($to));

       if ($cc != "") {
           $TO = array_merge($TO, explode(",", $this->strip_comment($cc))); //合并一个或多个数组
       }

       if ($bcc != "") {
           $TO = array_merge($TO, explode(",", $this->strip_comment($bcc)));
       }

       $sent = TRUE;
       foreach ($TO as $rcpt_to) {
           $rcpt_to = $this->get_address($rcpt_to);
           if (!$this->smtp_sockopen($rcpt_to)) {
               $this->log_write("Error: Cannot send email to " . $rcpt_to . "\n");
               $sent = FALSE;
               continue;
           }

           if ($this->smtp_send($this->host_name, $mail_from, $rcpt_to, $header, $body)) {
               $this->log_write("E-mail has been sent to <" . $rcpt_to . ">\n");
           } else {
               $this->log_write("Error: Cannot send email to <" . $rcpt_to . ">\n");
               $sent = FALSE;
           }
           fclose($this->sock);
           $this->log_write("Disconnected from remote host\n");

       }
      // echo "<br>";
       //echo $header;
       return $sent;
    }

    /* Private Functions */

    function smtp_send($helo, $from, $to, $header, $body = ""){
        if (!$this->smtp_putcmd("HELO", $helo)) {
            return $this->smtp_error("sending HELO command");
        }
       #auth
        if ($this->auth) {
            if (!$this->smtp_putcmd("AUTH LOGIN", base64_encode($this->user))) {
                return $this->smtp_error("sending HELO command");
            }
             if (!$this->smtp_putcmd("", base64_encode($this->pass))) {
                 return $this->smtp_error("sending HELO command");
             }
        }

        if (!$this->smtp_putcmd("MAIL", "FROM:<" . $from . ">")) {
            return $this->smtp_error("sending MAIL FROM command");
        }

        if (!$this->smtp_putcmd("RCPT", "TO:<" . $to . ">")) {
            return $this->smtp_error("sending RCPT TO command");
        }
        if (!$this->smtp_putcmd("DATA")) {
            return $this->smtp_error("sending DATA command");
        }

        if (!$this->smtp_message($header, $body)) {
            return $this->smtp_error("sending message");
        }
        if (!$this->smtp_eom()) {
            return $this->smtp_error("sending <CR><LF>.<CR><LF> [EOM]");
        }
        if (!$this->smtp_putcmd("QUIT")) {
            return $this->smtp_error("sending QUIT command");
        }
        return TRUE;
    }

    function smtp_sockopen($address){
        if ($this->relay_host == "") {
            return $this->smtp_sockopen_mx($address);
        } else {
            return $this->smtp_sockopen_relay();
        }
    }

    function smtp_sockopen_relay(){
        $this->log_write("Trying to " . $this->relay_host . ":" . $this->smtp_port . "\n");
        $this->sock = @fsockopen($this->relay_host, $this->smtp_port, $errno, $errstr, $this->time_out);

         if (!($this->sock && $this->smtp_ok())) {
             $this->log_write("Error: Cannot connenct to relay host " . $this->relay_host . "\n");
             $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
             return FALSE;

         }
         $this->log_write("Connected to relay host " . $this->relay_host . "\n");
         return TRUE;
    }

    function smtp_sockopen_mx($address){
        $domain = ereg_replace("^.+@([^@]+)$", "\\1", $address);
        if (!@getmxrr($domain, $MXHOSTS)) {
            $this->log_write("Error: Cannot resolve MX \"" . $domain . "\"\n");
            return FALSE;
        }
        foreach ($MXHOSTS as $host) {
            $this->log_write("Trying to " . $host . ":" . $this->smtp_port . "\n");
            $this->sock = @fsockopen($host, $this->smtp_port, $errno, $errstr, $this->time_out);
            if (!($this->sock && $this->smtp_ok())) {
                $this->log_write("Warning: Cannot connect to mx host " . $host . "\n");
                $this->log_write("Error: " . $errstr . " (" . $errno . ")\n");
                continue;
            }
            $this->log_write("Connected to mx host " . $host . "\n");
            return TRUE;
        }
        $this->log_write("Error: Cannot connect to any mx hosts (" . implode(", ", $MXHOSTS) . ")\n");
        return FALSE;
    }

    function smtp_message($header, $body){
        fputs($this->sock, $header . "\r\n" . $body);
        $this->smtp_debug("> " . str_replace("\r\n", "\n" . "> ", $header . "\n> " . $body . "\n> "));
        return TRUE;
    }

    function smtp_eom(){
        fputs($this->sock, "\r\n.\r\n");
        $this->smtp_debug(". [EOM]\n");
        return $this->smtp_ok();
    }

    function smtp_ok(){
        $response = str_replace("\r\n", "", fgets($this->sock, 512));
        $this->smtp_debug($response . "\n");
        if (!mb_ereg("^[23]", $response)) {
            fputs($this->sock, "QUIT\r\n");
            fgets($this->sock, 512);
            $this->log_write("Error: Remote host returned \"" . $response . "\"\n");
            return FALSE;
        }
        return TRUE;
    }

    function smtp_putcmd($cmd, $arg = ""){

        if ($arg != "") {
            if ($cmd == "") $cmd = $arg;
            else $cmd = $cmd . " " . $arg;
        }
        fputs($this->sock, $cmd . "\r\n");
        $this->smtp_debug("> " . $cmd . "\n");
        return $this->smtp_ok();

    }

    function smtp_error($string){
        $this->log_write("Error: Error occurred while " . $string . ".\n");
        return FALSE;

    }

    function log_write($message){

        $this->smtp_debug($message);
        if ($this->log_file == "") {
            return TRUE;
        }

        $message = date("M d H:i:s ") . get_current_user() . "[" . getmypid() . "]: " . $message;
        if (!@file_exists($this->log_file) || !($fp = @fopen($this->log_file, "a"))) {
            $this->smtp_debug("Warning: Cannot open log file \"" . $this->log_file . "\"\n");
            return FALSE;
        }
        flock($fp, LOCK_EX);
        fputs($fp, $message);
        fclose($fp);
        return TRUE;
    }

    function strip_comment($address){
        $comment = "\\([^()]*\\)";
        while (mb_ereg($comment, $address)) {
            $address = mb_ereg_replace($comment, "", $address);
        }
        return $address;
    }
    function get_address($address){
        $address = mb_ereg_replace("([ \t\r\n])+", "", $address);
        $address = mb_ereg_replace("^.*<(.+)>.*$", "\\1", $address);
        return $address;

    }

    function smtp_debug($message){
       if ($this->debug) {
           echo $message . "<br>";
       }
    }

    function get_attach_type($image_tag){
        $filedata = array();
        $img_file_con = fopen($image_tag, "r");
        unset($image_data);
        while ($tem_buffer = AddSlashes(fread($img_file_con, filesize($image_tag))))
            $image_data .= $tem_buffer;
            fclose($img_file_con);
            $filedata['context']  = $image_data;
            $filedata['filename'] = basename($image_tag);
            $extension            = substr($image_tag, strrpos($image_tag, "."), strlen($image_tag) - strrpos($image_tag, "."));

        switch ($extension) {
            case ".gif":
                $filedata['type'] = "image/gif";
                break;
            case ".gz":
                $filedata['type'] = "application/x-gzip";
                break;
            case ".htm":
                $filedata['type'] = "text/html";
                break;
            case ".html":
                $filedata['type'] = "text/html";
                break;
            case ".jpg":
                $filedata['type'] = "image/jpeg";
                break;
             case ".tar":
                 $filedata['type'] = "application/x-tar";
                 break;
            case ".txt":
                $filedata['type'] = "text/plain";
                break;
            case ".zip":
                $filedata['type'] = "application/zip";
                break;
            default:
                $filedata['type'] = "application/octet-stream";
                break;
        }
        return $filedata;

    }

}